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Here are some suggestions of development that come to my mind:
. Viewing the total space of each cloud and the space occupied (or remaining)
. In the same idea: viewing the cumulative space of all clouds (some graphic ?)
. Possibility to sorting the columns (Search)
. Having a cumulative view of all clouds (A bit like Windows apps Cumulo)
. Possibility to change the view: list, folder, detailed...
. More documents type preview
Et voila! That's all for now.